How do you unlock the hardest mode in the game in Earth Defense Force: Iron Rain? Known as the Disaster difficulty mode, this will test your knowledge and skills to the very limit. Here's how to unlock the Disaster difficulty mode in Earth Defense Force: Iron Rain.

How to Unlock the Disaster Difficulty Mode in Earth Defense Force: Iron Rain

Initially, Earth Defense Force: Iron Rain allows you to select a difficulty mode from four different options:

Easy

Normal

Hard

Hardest

In order to unlock the Disaster difficulty mode, you must complete the campaign. It does not matter which difficulty mode you complete it on, even easy can be selected. Once that's done, a pop-up upon completion will signal the unlock of the Disaster difficulty level.

In order to play missions on Disaster, head back into the save game that has the campaign completed. From there, select a mission you wish to replay, and you'll be able to select the Disaster difficulty mode. Be warned though, damage from friendly fire is at 100% in this mode. Disappointingly, you cannot start a new game and play through the game again on Disaster mode. You can only replay levels on the Disaster difficulty mode via your current save game.

Have you attempted any missions on the Disaster difficulty mode yet? Try not to break your controller in the comments below.